Shock absorber on sweep arm for picker motion looms



' Dec. 31, 1946. I J. NA LT 2,413,643

SHOCK ABS ORBER ON SWEEP ARM FOR PICKER MOTION LOOMS Fi led Ma 7, 1946 dfia vei7far Patented Dec. 31, 1946 UNITED STATES PATENT! OFFICE SHOCK ABSORBER ON SWEEP ARM FOR PICKER MOTION LOOMS Joseph Nault, Maynard, Mass.

Application May '7, 1946, Serial No. 667,913

My present invention relates to shock absorbers 5 Claims. (Cl. 139-147) and more particularly to shock absorbers'for sweep arms for picker motion looms.

metals resulting in breakdowns and loss of time."

Having the above defect in mind I have evolved an innovation in the sweep arm by providing for a yielding blow which is cushioned by means of a yieldable semi-solid rubber cushion which cannot crystallize, as happens'with steelsprings and the like therefore:

The principal object of my invention is an improved sweep arm for picker motion looms;

Another object is an improved sweep arm which provides for shock absorbing movement in the sweep arm itself, and I Other objects and novel features comprising the construction and operation of my device will progresses.

In the drawing illustrating the preferred em-- [2 which is inserted through the end ofa sweep stick, l3. The motion of the shoe ,bar I 0 and lever or sweep arm H is oscillatory, the shoe bar Ill being the driving member. The oscillatory motion is very fast and sudden, eventually resulting in the rupture of either the bar In or the sweep arm II or both. In some instances the failure occurs in the stud l2.

In Figs. 1 to 5 inclusive is illustrated my im- I proved shock absorbing sweep arm in which l4, 15 f and 16 indicate the shoe bar lever; the resilient shock absorbing member, and the sweep stick le-- ver respectively. The shoe bar lever 10 carries the'lever I4 which is provided with a hub portion Il securely fixed to the bar I!) by means of the set screws [8. To one side of the hub l! is provided an all set member 19 one side of which is provided with a shallow box recess 20. On the upper side of the hub portion I1 is provided hinge members 2|.

Hinged to the shoe bar lever I4 is the sweep stick lever l6 whichcomprises a main lever p'ortion 22 the lower end of which is pivoted in the bodiment of my invention but not necessarily the only one:

Fig. 1 is a side elevation of the improved sweep arm, the shoe bar being broken off and'shown in cross-section and the sweep arm broken off for convenience;

Fig. 2 is an elevation of the left-hand side of Fig. 1, the shoe bar being broken off and the sweep stick shown in cross-section;

Fig. 3 is an elevation of the right-hand side of Fig. 1, the'shoe bar being broken off;

Fig. 4 is a side elevation partially shown in cross-section, the sweep stick being broken ofi, and showing the device in a diflerent position;

Fig. 5 is a fragmentary cross-section taken on the line 5-5 of Fig. 2, and

Fig. 6 is a side elevation parts of which are broken oil and shown incross-section of a conventional sweep arm.

Referring more in detail to the drawing, 'andparticularly to Fig. 6, at It! I have shown the conventional shoe bar as used in picker motion looms upon which is mounted a conventional sweep arm II the upper end of which is provided with a stud hinge members 2| of the hub II by means of the clevis pin 23. The upper. end of the lever I6 is 0 provided witha yoke portion 24. The sweep stick l3 loosely rides in the yoke 24 on a stud 25iitted through suitable holes located through the said yoke. .On the inside surfaces of the two yoke'arnis recesses '26, see Fig. 5, are provided to increase the shear strength of the connection and at the same time to reduce. the possibility of the stud 24 be? coming loosened. A not 21 and lock washer 28 respectively are provided for the stud 25 to produce a solid union. The sweep stick I3 is of the conventional type usually being made of wood with a covering. of duck fabric and reinforcing plates 29 composed of laminated Bakelite or the equivalent. On one side ot the lever I6 is another box recess 30 directly opposite the box'recess 20.on the member l4. r The third member l5 which completes the as sembly is a block of resilient rubber'or the equivalent which fitsvinto the box recesses 20 and 30,

In operation the apparatus, as shown in Fig. 4, is in position for movementto the right. The shoe bar II) is suddenly snapped to the right, as shown in Fig.1, which causes the bar leverl H to suddenly compress-therubber block; l5 causing the sweep-lever member, l6 to movein the. same direction but the force of the blowflis mainly absorbed by :the rubber block l5. r

By a closer inspection of Fig. 5 it will be noted: that the lowermost end of the lever l6 pivoted on the pin 23 to the hub to the 'right before'the straight side 3| engages the face 32 of the hub but when the lever l9 compresses the rubber block l5 the face 32 of the hub is free to move away from the straight surface 3| of lever I6 thereby making it possible forthe two levers I4 and [6 to move toward each other while the levers are both moving to the right. The force is applied .at l0 and thence to the hub I! but the blow is struck midway between the bar I0 and the stud 25 thereby reducing the long leverage shown in Fig. 6 but at the 4 same time maintaining the same length of stroke in the scope of the appended claims.

Having thus described my, invention what I claim as new is: y

1. An improved shock absorbing sweep arm for picker motion looms comprising, an arm member fixed to the oscillating shoe bar of said loom, a second arm member pivoted to said first arm and having one end pivoted to a sweep stick of said loom, a resilient member interposed between said first arm and said second arm.

2. .An improved shock absorbing sweep arm for picker motion looms located between the reciprocating shoe bar and the sweep stick of said loom comprising, an offset lever fixed to said shoe bar having a recess on one side for receiving a re- I'! can move only slightly silient member, a" second lever pivoted to said first lever having an oppositely opposed recess for receiving a resilient member, one end of the second lever being pivoted to said sweep stick, a resilient member interposed between the .two

- levers and held in said recesses.

3. An improved shock absorbing sweep arm for picker motion looms located between thereciprocating shoe bar and the sweep stick comprising, an offset lever fixed to said shoe bar having a hinge portion located at ninety degrees to the stick lever member, and a resilient rubber block 4 mounted in said receptacles.

4. In a picker motion loom having a reciprocating sweep stick and a reciprocating shoe bar,

a compound sweep lever connecting said, stick with said bar, a-resilient member located in said compound member adapted to absorb the shock between said bar and said stick.

5. In a picker motion loom having a reciprocating sweep stick and a reciprocating shoe bar.-

JOSEPH NAULT. 

